<div class="container">
    <nz-select nzMode="multiple" nzPlaceHolder="Inserted are removed" [(ngModel)]="listOfSelectedValue">
        <nz-option nzCustomContent nzLabel="Windows" nzValue="windows">
            <nz-tree
                [nzData]="nodes"
                nzCheckable
                nzMultiple
                [nzCheckedKeys]="defaultCheckedKeys"
                (nzClick)="nzEvent($event)"
                (nzExpandChange)="nzEvent($event)"
                (nzCheckBoxChange)="nzEvent($event)"
                >
            </nz-tree>
        </nz-option>

        <!-- <nz-option *ngFor="let option of defaultOption" [nzLabel]="option" [nzValue]="option" nzHide></nz-option> -->

    </nz-select>
</div>